2025 Volume 67 Issue 2 Pages 149-154
A 41-year-old man was admitted to our hospital with upper abdominal pain and discomfort in the lower right abdomen. He had eaten raw mackerel and bonito the previous day. A contrast-enhanced CT scan of the abdomen showed ascites and localized thickening of the terminal ileum, along with signs of inflammation. Given the suspicion of ileal anisakiasis, we performed transanal single-balloon endoscopy (SBE). The procedure revealed a swollen, submucosal tumor-like appearance in the terminal ileum. Anisakis larvae were found at the site and successfully removed with endoscopic forceps. The patientʼs symptoms improved quickly after the procedure. Follow-up SBE four weeks later showed that the swelling had fully resolved. Ileal anisakiasis displayed characteristics similar to gastric anisakiasis, with the distinctive feature of a “vanishing tumor” appearance.
